128382731 has 2 divisors, whose sum is σ = 128382732. Its totient is φ = 128382730.

The previous prime is 128382719. The next prime is 128382799. The reversal of 128382731 is 137283821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128382731 - 2¹⁰ = 128381707 is a prime.

It is a super-2 number, since 2×128382731² = 32964251238036722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 128382691 and 128382700.

It is not a weakly prime, because it can be changed into another prime (128582731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64191365 + 64191366.

It is an arithmetic number, because the mean of its divisors is an integer number (64191366).

Almost surely, 2^128382731 is an apocalyptic number.

128382731 is a deficient number, since it is larger than the sum of its proper divisors (1).

128382731 is an equidigital number, since it uses as much as digits as its factorization.

128382731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 128382731 is about 11330.6103542572. The cubic root of 128382731 is about 504.4702231068.

The spelling of 128382731 in words is "one hundred twenty-eight million, three hundred eighty-two thousand, seven hundred thirty-one".